inkexport is a batch export tool for iOS developers, using Inkscape. To add a few information for your SVG, you can export all PNG files, including Retina images (@2x), at one time.

1. Run Inkscape, and create SVG file.
2. Add export layer for export.
3. Add rectangles to export layer as export area.
4. Select a rectangle, and choose Object > Object Properties.
5. Input an export file name to Label field, except file extension.
6. Press Apply button.
7. Finally, set Opacity of export layer to 0%.
8. Save your SVG file.

Open a terminal, and run the command as follows.

$ inkexport -f [SVG file] -o [output dir]